I'm just back from a week in Cornwall, during which I've managed to gather large amounts of useful GPS data every day. Since I didn't have Internet access while I was there, I now have the task of updating the map based on the tracks and the copious notes I took at the time.
It seems like Cornwall in general has a long way to go before its up to the same standard as the areas around where I live in Swansea. I hope that this last week's activities will go some way towards fixing this.
One of the great advantages of visiting Cornwall at this time of year is that there are few other visitors, and taking detours down the many single track country lanes isn't such a problem as you are far less likely to meet something coming the other way :-)
I also visited the second hand book shops in search of out of copyright maps of the area. I have a street plan of Penzance which looks useful as not too much has changed. The plan of St. Ives in the same book, though, looks like its not going to be of any real use, which is a pity.
I'd love to go back and do a bit more mapping there, but next time I'll try and find some accommodation which is on the Internet as that makes things a lot easier.